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Sparganium
	Simplestem bur-reed (Sparganium erectum)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Clade:	Commelinids
Order:	Poales
Family:	Typhaceae
Genus:	Sparganium; L.
Synonyms
	Platanaria Gray;

Sparganium (bur-reed) is a genus of flowering plants, described as a genus by Linnaeus in 1753.^[2]^[3] It is widespread in wet areas in temperate regions of both the Northern and Southern Hemispheres.^[1] The plants are perennial marsh plants that can grow to 3.5 m (depending on the species), with epicene flowers.^[4]^[5]

It was previously placed alone in the family Sparganiaceae. Sparganium is closely related to the Typhaceae and the APG III system (2009) includes Sparganium in that family. It has been determined from phylogenetic analysis to be the closest living relative of the genus Typha (cat-tail).

Summary

Sparganium, commonly known as the bur-reed, is a genus of aquatic plants of shallow marshes, ponds, and streams. There are 9 species found in the United States and Canada.^[6] The stem, which may be floating or emergent, emerges from a buried rhizome, which like many wetland plants, is dependent upon aerenchyma to transport oxygen to the rooting zone. The leaves are strap-like. The flowers are borne in spherical heads, which bear either male or female flowers.^[7] The seeds may accumulate in the soil as dense seed banks, which allow the plants to regenerate during low water periods.^[8]

Sparganium is an important component of aquatic and marsh vegetation in temperate to arctic regions. It provides food and cover for wildlife and waterfowl.

The genus name Sparganium was published by Linnaeus in Species Plantarum (1753), with two species recognized: S. erectum and S. natans.

Perhaps the first mention of Sparganium in the English language was made by William Turner (1562).^[9] Turner noted that there was no name for the plants in English, and suggested bede sedge or knop sedge. Further, he noted, "the virtues of Sparganium: The roote is good to be geven wyth wyne agaynste the poyson of serpentes."

Taxonomy

Species^[1]^[10]^[11]^[12]

Sparganium acaule – eastern North America^[13]
Sparganium americanum – eastern North America
Sparganium androcladum – eastern North America
Sparganium angustifolium – Europe, Asia, North America
Sparganium confertum – Yunnan
Sparganium emersum – Europe, Asia, North America
Sparganium × englerianum – Germany
Sparganium erectum – Europe, Asia, North America
Sparganium eurycarpum – Russian Far East, Japan, North America
Sparganium fallax – East Asia, Himalayas, Sumatra, New Guinea
Sparganium fluctuans – Canada, northern United States (New England, NY PA NJ MI WI MN WA)
Sparganium glomeratum – Scandinavia, Baltics, Belarus, Russia, China, Mongolia, Japan, Canada, Minnesota, Wisconsin
Sparganium gramineum – Scandinavia, Baltics, Russia, Japan
Sparganium hyperboreum – Alps, Subarctic (Europe, Russia, Alaska, Canada, Greenland)
Sparganium japonicum – Primorye, Japan, Korea
Sparganium kawakamii – Sakhalin, Kuril Islands
Sparganium limosum – Yunnan
Sparganium × longifolium – northern Russia
Sparganium natans – Europe, Asia, North America
Sparganium × oligocarpon – Siberia
Sparganium probatovae – Kamchatka
Sparganium rothertii – Siberia, Manchuria, Japan
Sparganium × speirocephalum – Finland
Sparganium × splendens – western Russia
Sparganium stoloniferum – temperate Asia
Sparganium subglobosum – East Asia, Himalayas, New Guinea, Australia, New Zealand
Sparganium yunnanense – Yunnan

Fossil record

Many fossil endocarps and a few seeds of †Sparganium pusilloides have been described from middle Miocene strata of the Fasterholt area near Silkeborg in Central Jutland, Denmark. Otherwise the species has been recorded from the Middle Oligocene to the Middle Miocene floras of Central Europe, among these from the Middle Oligocene Haselbacher See clay in Leipzig. Fossils of 20 endocarps of †Sparganium simplex and 1 endocarp of †Sparganium multiloculare have also been described from the Fasterholt area near Silkeborg in Central Jutland, S. multiloculare is also described from the Oligocene of southern England and the Oligocene and Miocene floras of Central Europe and Western Siberia.^[14] Sparganium is also recorded in Pliocene and Miocene floras of Arctic North America^[15]

References

^ ^a ^b ^c Kew World Checklist of Selected Plant Families
^ Linnaeus, Carl von. 1753. Species Plantarum 2: 971 in Latin
^ Tropicos, Sparganium L.
^ Flora of North America Vol. 22, bur-reed, Sparganium Linnaeus
^ Flora of China, Vol. 23 Page 158 黑三棱属 hei san leng shu Sparganium Linnaeus
^ Kaul, RB (1997). Sparganiaceae. In: Flora of North America. and Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 12+ vols. New York and Oxford. Vol. 22. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=130772
^ Sparganium research page, UW-Madison Dept. of Botany http://botany.wisc.edu/jsulman/jsulman.htm
^ Keddy, P.A. (2010). Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK.
^ Turner, William (1562). A new herbal. Republished 1995, GTL Chapman, MN Tweddle, eds. Cambridge U. Press.
^ Cook and Nicholls (1986) A monographic study of the genus Sparganium. Part 1: Subgenus Xanthosparganium. Botanica Helvetica 96: 213-267
^ Cook and Nicholls (1987) A monographic study of the genus Sparganium. Part 2: Subgenus Sparganium. Botanica Helvetica 97: 1-44
^ Biota of North America 2013 county distribution maps
^ Ito, Y., Nr. Tanaka, C.-K. Kim, R. Kaul, D. C. Albach (2015) Phylogeny of Sparganium (Typhaceae) revisited: Non-monophyletic nature of S. emersum sensu lato and resurrection of S. acaule. Plant Systematics and Evolution 301(9): xxx-xxx.
^ Angiosperm Fruits and Seeds from the Middle Miocene of Jutland (Denmark) by Else Marie Friis, The Royal Danish Academy of Sciences and Letters 24:3, 1985
^ Fletcher, Tamara; Telka, Alice; Rybczynski, Natalia; John, Matthews (2021). "Neogene and early Pleistocene flora from Alaska, USA and Arctic/Subarctic Canada: New data, intercontinental comparisons and correlations". Palaeontologia Electronica. 24 (1) a08. doi:10.26879/1121.